544
FNCA52 TJSJ 200730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SAT JUN 20 2026
DISCUSSION
A FIRE DANGER STATEMENT HAS BEEN ISSUED FOR TODAY ACROSS PORTIONS
OF THE COASTAL PLAINS AND HILLS OF SOUTHERN AND WESTERN PUERTO
RICO, VIEQUES AND ST. CROIX DUE TO THE COMBINATION OF CRITICALLY
DRY FUELS, SUSTAINED WINDS OF 15 TO 20 MPH WITH GUSTS UP TO
25 MPH, AND MINIMUM RELATIVE HUMIDITY VALUES IN THE LOW 50S OR
EVEN IN THE 40S. THESE CONDITIONS WILL FAVOR RAPID WILDFIRE
IGNITION AND EXTREME FIRE BEHAVIOR, MEANING ANY FIRES THAT
DEVELOP WILL LIKELY SPREAD QUICKLY AND BECOME DIFFICULT TO
CONTAIN. OUTDOOR BURNING IS HIGHLY DISCOURAGED.
FIRE AND EMERGENCY OFFICIALS SHOULD BE AWARE THAT WEATHER
CONDITIONS ARE BECOMING MORE CONDUCIVE FOR THE IGNITION AND
SPREAD OF WILDFIRES.
PRZ014-202000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER CLEAR MCLEAR PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 30 50
TEMP (24H TREND) 93 (+3) 74 (-2) 91
RH % (24H TREND) 42 (-8) 85 (+2) 47
WIND 20FT/EARLY(MPH) E 17 E 14 E 16
WIND 20FT/LATE(MPH) SE 18 NE 12 E 17
MIXING HGT(FT-AGL/MSL)4830 5070
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 72450 86190
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-202000-
SOUTHERN HILLS-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 10 40
TEMP (24H TREND) 89 (+3) 71 (-2) 87
RH % (24H TREND) 53 (-10) 94 (+3) 61
WIND 20FT/EARLY(MPH) E 12 E 13 E 13
WIND 20FT/LATE(MPH) SE 13 E 13 E 13
MIXING HGT(FT-AGL/MSL)5300 5810
TRANSPORT WND (MPH) E 15 E 18
VENT RATE (KT-FT) 68900 92960
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-202000-
NORTH COASTAL PLAINS-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 10 60
TEMP (24H TREND) 91 (+1) 74 (-1) 90
RH % (24H TREND) 56 (-9) 92 (-1) 61
WIND 20FT/EARLY(MPH) E 14 E 19 E 17
WIND 20FT/LATE(MPH) E 21 E 12 E 21
MIXING HGT(FT-AGL/MSL)4810 5530
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 62530 99540
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-202000-
NORTHERN HILLS-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 30 0 70
TEMP (24H TREND) 90 (+1) 71 (-2) 89
RH % (24H TREND) 57 (-8) 93 (-2) 63
WIND 20FT/EARLY(MPH) E 13 E 16 E 14
WIND 20FT/LATE(MPH) NE 18 E 10 E 18
MIXING HGT(FT-AGL/MSL)6050 6910
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 66550 89830
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-202000-
WEST COAST-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 60 0 50
TEMP (24H TREND) 93 (+1) 74 (0) 92
RH % (24H TREND) 55 (-7) 91 (-2) 59
WIND 20FT/EARLY(MPH) E 13 E 11 E 14
WIND 20FT/LATE(MPH) E 13 E 12 E 16
MIXING HGT(FT-AGL/MSL)5010 4640
TRANSPORT WND (MPH) E 9 E 13
VENT RATE (KT-FT) 40080 51040
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-202000-
EASTERN INTERIOR-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 50 70
TEMP (24H TREND) 89 (+2) 72 (-2) 88
RH % (24H TREND) 56 (-10) 95 (+2) 63
WIND 20FT/EARLY(MPH) E 12 E 14 E 14
WIND 20FT/LATE(MPH) E 13 E 14 E 14
MIXING HGT(FT-AGL/MSL)5880 6000
TRANSPORT WND (MPH) E 15 E 18
VENT RATE (KT-FT) 76440 96000
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-202000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 60 70
TEMP (24H TREND) 85 (+4) 70 (-2) 83
RH % (24H TREND) 62 (-14) 99 (+4) 70
WIND 20FT/EARLY(MPH) E 11 E 12 E 12
WIND 20FT/LATE(MPH) E 12 E 11 E 13
MIXING HGT(FT-AGL/MSL)4630 4670
TRANSPORT WND (MPH) E 16 E 20
VENT RATE (KT-FT) 64820 79390
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-202000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 60 0 60
TEMP (24H TREND) 88 (+4) 68 (-2) 88
RH % (24H TREND) 57 (-11) 95 (0) 65
WIND 20FT/EARLY(MPH) E 10 E 8 E 10
WIND 20FT/LATE(MPH) E 10 E 8 E 11
MIXING HGT(FT-AGL/MSL)8850 7770
TRANSPORT WND (MPH) E 9 E 14
VENT RATE (KT-FT) 70800 93240
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-202000-
CAYEY MOUNTAIN RANGE-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 0 60 70
TEMP (24H TREND) 85 (+3) 71 (-1) 83
RH % (24H TREND) 60 (-11) 97 (0) 70
WIND 20FT/EARLY(MPH) E 11 E 11 E 11
WIND 20FT/LATE(MPH) E 12 E 11 E 12
MIXING HGT(FT-AGL/MSL)4870 5120
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 73050 87040
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-202000-
VIEQUES-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 60 50
TEMP (24H TREND) 88 (+1) 76 (-2) 89
RH % (24H TREND) 58 (-6) 91 (+3) 61
WIND 20FT/EARLY(MPH) E 14 E 19 E 18
WIND 20FT/LATE(MPH) E 14 E 18 E 18
MIXING HGT(FT-AGL/MSL)3660 3580
TRANSPORT WND (MPH) E 18 E 23
VENT RATE (KT-FT) 58560 71600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-202000-
CULEBRA-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 60 50
TEMP (24H TREND) 90 (+2) 76 (-3) 90
RH % (24H TREND) 56 (-11) 95 (+9) 59
WIND 20FT/EARLY(MPH) E 14 E 19 E 18
WIND 20FT/LATE(MPH) E 14 E 18 E 18
MIXING HGT(FT-AGL/MSL)3600 3480
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 57600 66120
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-202000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 30
TEMP (24H TREND) 93 (+2) 75 (-1) 93
RH % (24H TREND) 45 (-6) 79 (-3) 48
WIND 20FT/EARLY(MPH) E 18 E 16 E 21
WIND 20FT/LATE(MPH) SE 19 E 13 E 21
MIXING HGT(FT-AGL/MSL)4960 5000
TRANSPORT WND (MPH) E 16 E 22
VENT RATE (KT-FT) 69440 95000
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-202000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 60 50
TEMP (24H TREND) 87 (+1) 74 (-5) 87
RH % (24H TREND) 61 (-9) 99 (+14) 64
WIND 20FT/EARLY(MPH) E 16 E 19 E 18
WIND 20FT/LATE(MPH) E 13 E 19 E 18
MIXING HGT(FT-AGL/MSL)3680 3400
TRANSPORT WND (MPH) E 16 E 23
VENT RATE (KT-FT) 51520 68000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-202000-
ST CROIX-
330 AM AST SAT JUN 20 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 50
TEMP (24H TREND) 88 (+1) 77 (-1) 88
RH % (24H TREND) 61 (-8) 89 (+1) 65
WIND 20FT/EARLY(MPH) E 16 E 19 E 18
WIND 20FT/LATE(MPH) E 14 E 19 E 18
MIXING HGT(FT-AGL/MSL)4460 4560
TRANSPORT WND (MPH) E 18 E 24
VENT RATE (KT-FT) 71360 95760
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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